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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > VRSF catless downpipe fix - Is it Okay if I leave it?



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      08-18-2018, 01:57 PM   #23
cRo5
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Quote:
Originally Posted by MIL.SPEC View Post
Well that is new information. I thought you leave DP fix in all the time?

My engine light just came on and my car started idling rough. Is that normal or do I have bigger problems?

I left my DME reader at home today.
How long ago was your DP Fix installed?

I'm not sure either, seems like there's a bit of conflicting information. I installed the N55 DP Fix two weeks ago and want to avoid this problem if possible.
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      08-24-2018, 04:20 PM   #24
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Originally Posted by cRo5 View Post
How long ago was your DP Fix installed?

I'm not sure either, seems like there's a bit of conflicting information. I installed the N55 DP Fix two weeks ago and want to avoid this problem if possible.
The other week.

It seems this is more hassle than it's worth. May as well find a place that can deal with this and take off the DP fix. I don't think it's worth the hassle after installing it and having it still not fix all the issues.
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      08-25-2018, 04:27 PM   #25
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Quote:
Originally Posted by cRo5 View Post
How long ago was your DP Fix installed?

I'm not sure either, seems like there's a bit of conflicting information. I installed the N55 DP Fix two weeks ago and want to avoid this problem if possible.
N55 you can leave it installed but the DP fix only works on pneumatic waste gate cars
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      08-26-2018, 10:07 PM   #26
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I installed mine last night and it's throwing codes. Tiago is being non-responsive. Can anyone help?
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      08-27-2018, 08:40 AM   #27
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Kind of a stupid question... will an aftermarket catted downpipe for n55 resolve all the issues with throwing codes and showing ready status in order to pass emissions?
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      08-27-2018, 09:52 AM   #28
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Originally Posted by bill109 View Post
Kind of a stupid question... will an aftermarket catted downpipe for n55 resolve all the issues with throwing codes and showing ready status in order to pass emissions?
The DP fix does NOT suppress codes, rather it fixes the signal coming from the pipes so that the electronics believe your O2 sensor is receiving the signal it would see with a Cat present.

Beyond that you still have to deal with any other issues.
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      08-27-2018, 09:57 AM   #29
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Let end this with we all agree that IT IS NOT OK TO LEAVE IT ON.
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      08-27-2018, 07:42 PM   #30
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Quote:
Originally Posted by J3 View Post
I installed mine last night and it's throwing codes. Tiago is being non-responsive. Can anyone help?
what codes are you getting?
is it this one, O2 sensor after cat shorted to B+
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      10-11-2018, 11:25 AM   #31
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Originally Posted by Pladi View Post
Let end this with we all agree that IT IS NOT OK TO LEAVE IT ON.
So whatís being done to get rid of the CEL? Iím about to install FMIC, Catless Dp, and CP upgrades in 2 days. I purchased the VRSF DP Fix for emissions. If I donít install it, can I clear the CEL with the JB4? Iíve read you can and you canít. Just like leaving the DP fix on. You can and canít is what I read.

So if I do all this work and get a CEL, whatís my solution? Just trying to be prepared.

2016 M235i xD (dp, cp, fmic, jb4, muffler bypass)
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      10-11-2018, 01:43 PM   #32
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Originally Posted by saadams95 View Post
So whatís being done to get rid of the CEL? Iím about to install FMIC, Catless Dp, and CP upgrades in 2 days. I purchased the VRSF DP Fix for emissions. If I donít install it, can I clear the CEL with the JB4? Iíve read you can and you canít. Just like leaving the DP fix on. You can and canít is what I read.

So if I do all this work and get a CEL, whatís my solution? Just trying to be prepared.

2016 M235i xD (dp, cp, fmic, jb4, muffler bypass)
Get a tune that disables it. Idk if the new jb4 firmware does. The DP fix should only be used to pass emissions
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      10-11-2018, 04:08 PM   #33
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Quote:
Originally Posted by saadams95 View Post
So whatís being done to get rid of the CEL? Iím about to install FMIC, Catless Dp, and CP upgrades in 2 days. I purchased the VRSF DP Fix for emissions. If I donít install it, can I clear the CEL with the JB4? Iíve read you can and you canít. Just like leaving the DP fix on. You can and canít is what I read.

So if I do all this work and get a CEL, whatís my solution? Just trying to be prepared.

2016 M235i xD (dp, cp, fmic, jb4, muffler bypass)
Quote:
Originally Posted by lwgrenier View Post
Get a tune that disables it. Idk if the new jb4 firmware does. The DP fix should only be used to pass emissions
The DP fix will keep the CEL off if you are driving normally. If you are heavy on the pedal the CEL will come on even with the fix. When emissions time comes, make sure to revert back to a stock or stage 1 file where the O2 sensor is turned on so you can have readiness for emissions. During this time, make sure you are light on the pedal. Also, I have had my DP fix in for over a year without any issues.
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      10-11-2018, 04:12 PM   #34
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Quote:
Originally Posted by NRigs View Post
The DP fix will keep the CEL off if you are driving normally. If you are heavy on the pedal the CEL will come on even with the fix. When emissions time comes, make sure to revert back to a stock or stage 1 file where the O2 sensor is turned on so you can have readiness for emissions. During this time, make sure you are light on the pedal. Also, I have had my DP fix in for over a year without any issues.
Do you have an N55 with the VRSF DP Fix?

Also, have your AFR values been changing? I've read about how it throws those values off? Have you noticed an increase or decrease with this? Also what mods are you on?
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      10-11-2018, 04:42 PM   #35
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Quote:
Originally Posted by saadams95 View Post
Do you have an N55 with the VRSF DP Fix?

Also, have your AFR values been changing? I've read about how it throws those values off? Have you noticed an increase or decrease with this? Also what mods are you on?
I am a 2011 N55. My AFR values are where they should be. I believe it throws the AFRs off for the N54 engines, not N55. My mods are dp, air intake, intercooler, chargepipe and MHD stage 2+.
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      10-11-2018, 04:45 PM   #36
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Quote:
Originally Posted by NRigs View Post
Quote:
Originally Posted by saadams95 View Post
Do you have an N55 with the VRSF DP Fix?

Also, have your AFR values been changing? I've read about how it throws those values off? Have you noticed an increase or decrease with this? Also what mods are you on?
I am a 2011 N55. My AFR values are where they should be. I believe it throws the AFRs off for the N54 engines, not N55. My mods are dp, air intake, intercooler, chargepipe and MHD stage 2+.
I think I might just be doing the MHD BEF cause then I can just use the speed limiter delete also. Just have to figure out which BEF I will need.
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